Spark plug



@etented pr. i?, i923..

Applieation tiled .llaclfl will.

ToalZ-wiiomz'tmy zzo/neem:

Be it known that l, FRANCIS A. Geenen., a citizen of the United States,sind resident of Chicago, in the county of Cook and State of Illinois,have in'vcio' .ad a certain new and useful improvement in Spark Plugs,of which the following is a full, clear, concise,

and exact description, reference being lied to the accompanyingdrawings, forming a part of this specification.

My invention relates to spark plugs for -use 1n connection with internalcombustion engines, and the principal object of the invention is toprovide an entirely satisfactory device of this kindithat is of ru gedconstruction, that may be economically manufactured, andwhich is soconstructed as to CII aord one or more intensiiergeps which are providedby parts-of the lug unit.

Other features of novelty will appear Pis the following detaileddescription progresses.

In the drewi view of e plug s invention. Y

A represents the integral metal spark plus; siiell,v which comprises theconventional threaded portion l, the flange 2 and hexagonal nut 3. Nearits lower end the shell l have shown e. sectional owing the features ofmy A is provided with an annular beveled v shoulder 4, which co-operateswith e corresponding shoulder 5, formed on the insulator B. A gasket 6is conveniently interposed between shoulders l and 5, as illustrated.The member B may be formed ofI any one of the materials commonlyeinployed as spark plug insulators. The insulator B is held in positionby the externally threaded collar 7, which co-operates with in- .ternalscrew threads at the kupper end of shell A. A suitable gasket 8 ispreferably interposed between collar 7 and insulator shoulder 9. Thesleeve B is formed to provide a pair of recesses -in which electrodemembers C1, C2 and Cs are intended to o0- operate for the purpose ofintensifying the spark. Electrode C1 is threaded in the sleeve 10imbedded in the insulator sleeve B, and seid electrode terminateswitliin revtricity conducting material. the

serial me.

cess l2 sind co-opei; ti'ode C3. Electrode is ed in e sleeve, and tneybe sired position by. lee-lt mit CB is provided 'with a slionigrests ontbe upper the centi'al petition ei 'time the web is formed with n oeivethe lower portion oi the said lower potion se to receive loclt nut 4:2.is illu trade (32 cooperates with eic-U terminetes in recess "l2-bphere.

Preferably imbedded in the shell, and projecting do' from, is n pin l?of cot which 'lies its ifree end ti gies to the insulated directlyunder, init spec most portion oi the insulated ele bedded in theinsulator E downwardly therefrom is e insuleted electrode-C2 en pin i7.l

ln practice, the members Cf and, adjusted that the gap between tl C1 andCS andthe gap between tlv 'S3 and C2 are substantially eq other, endsubstantially equal to .ne et the lower portion of tile end lower endsoi the longitudine i in the insulator are eectively ciosed so the sparkspassing the two confined derive such benefit as is afforded opeintingwithin the confined space troni wl'iicle the oxygen has been.dissipated.

Het-ving thus described my invention, wim l claim is new and desire tosecure by ters Patent ot the `lUnited States A spark plug oomprisine enie i provided with en electrode, en sleeve inounted in tlie metalsleeve, sulator sleeve being provide.. i longiudinal recesses seperatedby xegm Wall of the insulator sleeve, a central eefrtrode mounted in theWall, means to ad- 'just said electrode, end closures for said recess,threaded inner and outer' electrodes nxounted in said end closures and(zo-operating with said central electrode, and an elec rnde imbedded inthe insulator sleeve and having; its free end disposed between the innerelectrode terminal and the electrode on' the metal sleeve.

Inl Stness whereof, I hereunto subscribe my name this 4th dayvof March,1921.

FRANCIS A. CARTER. Witnesses:

ALBIN C. AHLBERG, E. J. BoURGEoIs.

